Re: I've lost my k. Can someone help me find it?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jolyon Vater Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>

Single-MOT coil? How do you do that?

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, September 26, 2002 2:57 PM
Subject: Re: I've lost my k. Can someone help me find it?


> Original poster: "Malcolm Watts by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
>
> Hi Dan,
>
> On 25 Sep 2002, at 23:07, Tesla list wrote:
>
> > Original poster: "Daniel Barrett by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <dbarrett1-at-austin.rr-dot-com>
> >
> >     Hi List-
> >
> >     Thanks to everyone who helped me find my K. I spent about 3 hours
with
> > my single-MOT coil  today constructing an arrangement to vary my
secondary
> > height. I carefully measured K12 at each 1/8" interval beginning with
the
> > bottom turn of secondary 1/2 inch below the primary plane, all the way
up to
> > 4" above. Armed with this spiffy spreadsheet we went out to the backyard
to
> > play. After trying all the variations I came to the following
conclusion:
> >
> >     "It just doesn't freekin' matter."
> >
> >     I don't see any sweet spots, nulls or anything exciting at all. Arc
> > length appears to be proportional to K until it gets so high that racing
> > arcs occur and corrona starts coming out of all the bits it isn't
supposed
> > to.
> >
> >     I get arcs about 60 inches (at 1.4kW) with k at about .19 and racing
> > sparks above about .21.  My observations suggest that K is not something
> > worth tweaking, at least not as important as detuning to compensate for
> > streamer loading, spark gap, etc.
> >
> > Is this consistant with what others are seeing?
>
> You're getting about the same sparklength as I got in one coil with
> about the same power and a bit lower k. k is not a parameter I've
> bothered playing with much. I mainly measure it in a finished coil
> for interest's sake.
>
> Regards,
> Malcolm
>
> > Does it become more critical at higher power levels or other conditions?
> >
> > db
> >
> >
> >
> >
>
>
>
>
>